<template>
    <div class="component-upload-image">
        <el-upload multiple :action="uploadImgUrl" list-type="picture-card" :on-success="handleUploadSuccess"
            :before-upload="handleBeforeUpload" :limit="limit" :on-error="handleUploadError" :on-exceed="handleExceed"
            ref="imageUpload" :before-remove="handleDelete" :show-file-list="true" :headers="headers"
            :file-list="fileList" :on-preview="handlePictureCardPreview" :class="{ hide: fileList.length >= limit }"
            :data="uploadData">
            <el-icon class="avatar-uploader-icon">
                <plus />
            </el-icon>
        </el-upload>
        <!-- 上传提示 -->
        <!-- <div class="el-upload__tip" v-if="showTip">
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
<template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
的文件
</div> -->

        <el-dialog v-model="dialogVisible" title="预览" width="800px" :append-to="$refs['app-container']" draggable
            destroy-on-close>
            <img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
        </el-dialog>
    </div>
</template>

<script setup>
import { getToken } from "@/utils/auth";

const props = defineProps({
    modelValue: [String, Object, Array],
    // 图片数量限制
    limit: {
        type: Number,
        default: 5,
    },
    // 大小限制(MB)
    fileSize: {
        type: Number,
        default: 5,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
        type: Array,
        default: () => ["png", "jpg", "jpeg"],
    },
    // 是否显示提示
    isShowTip: {
        type: Boolean,
        default: true
    },
    // platform参数
    platForm: {
        type: String,
        default: ""
    },
});

const { proxy } = getCurrentInstance();
const emit = defineEmits();
const number = ref(0);
const uploadList = ref([]);
const dialogImageUrl = ref("");
const dialogVisible = ref(false);
const baseUrl = import.meta.env.VITE_APP_BASE_API;
const uploadImgUrl = ref(import.meta.env.VITE_APP_BASE_API + "/upload"); // 上传的图片服务器地址
const headers = ref({ Authorization: "Bearer " + getToken() });
const fileList = ref([]);
const uploadData = ref({
    platForm: props.platForm
});
const showTip = computed(
    () => props.isShowTip && (props.fileType || props.fileSize)
);

watch(() => props.modelValue, val => {
    if (val) {
        // 首先将值转为数组
        const list = Array.isArray(val) ? val : props.modelValue.split(",");
        // 然后将数组转为对象数组
        fileList.value = list.map(item => {
            // 如果 item 是字符串，统一处理成对象
            if (typeof item === "string") {
                const url = item.indexOf(baseUrl) === -1 && props.platForm === '' ? baseUrl + item : item;
                return { name: url, url };
            }
            // 如果 item 已经是对象，直接返回
            return item;
        });
        // fileList.value = list.map(item => {
        //   if (typeof item === "string") {
        //     if (item.indexOf(baseUrl) === -1) {
        //       item = { name: baseUrl + item, url: baseUrl + item };
        //     } else {
        //       item = { name: item, url: item };
        //     }
        //   }
        //   return item;
        // });
    } else {
        fileList.value = [];
        return [];
    }
}, { deep: true, immediate: true });

// 上传前loading加载
function handleBeforeUpload(file) {
    let isImg = false;
    if (props.fileType.length) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
            fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        isImg = props.fileType.some(type => {
            if (file.type.indexOf(type) > -1) return true;
            if (fileExtension && fileExtension.indexOf(type) > -1) return true;
            return false;
        });
    } else {
        isImg = file.type.indexOf("image") > -1;
    }
    if (!isImg) {
        proxy.$modal.msgError(
            `文件格式不正确, 请上传${props.fileType.join("/")}图片格式文件!`
        );
        return false;
    }
    if (props.fileSize) {
        const isLt = file.size / 1024 / 1024 < props.fileSize;
        if (!isLt) {
            proxy.$modal.msgError(`上传头像图片大小不能超过 ${props.fileSize} MB!`);
            return false;
        }
    }
    proxy.$modal.loading("正在上传图片，请稍候...");
    number.value++;
}

// 文件个数超出
function handleExceed() {
    proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
}

// 上传成功回调
function handleUploadSuccess(res, file) {
    if (res.url) {
        uploadList.value.push({ name: '/profile/' + res.path + res.filename, url: res.url });
        uploadedSuccessfully();
    } else {
        number.value--;
        proxy.$modal.closeLoading();
        proxy.$modal.msgError(res.msg);
        proxy.$refs.imageUpload.handleRemove(file);
        uploadedSuccessfully();
    }
}

// 删除图片
function handleDelete(file) {
    const findex = fileList.value.map(f => f.name).indexOf(file.name);
    if (findex > -1 && uploadList.value.length === number.value) {
        fileList.value.splice(findex, 1);
        emit("update:modelValue", listToString(fileList.value));
        return false;
    }
}

// 上传结束处理
function uploadedSuccessfully() {
    if (number.value > 0 && uploadList.value.length === number.value) {
        fileList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value);
        uploadList.value = [];
        number.value = 0;
        emit("update:modelValue", listToString(fileList.value));
        proxy.$modal.closeLoading();
    }
}

// 上传失败
function handleUploadError() {
    proxy.$modal.msgError("上传图片失败");
    proxy.$modal.closeLoading();
}

// 预览
function handlePictureCardPreview(file) {
    let url = file.url;
    if (!url.includes(baseUrl)) {
        url = baseUrl + url;
    }
    dialogImageUrl.value = url;
    dialogVisible.value = true;
}

// 对象转成指定字符串分隔
function listToString(list, separator) {
    let strs = "";
    separator = separator || ",";
    for (let i in list) {
        if (undefined !== list[i].url && list[i].url.indexOf("blob:") !== 0) {
            strs += list[i].url.replace(baseUrl, "") + separator;
        }
    }
    return strs != "" ? strs.substr(0, strs.length - 1) : "";
}
</script>

<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
:deep(.hide .el-upload--picture-card) {
    opacity: 0;
    pointer-events: none;
    height: 0px !important;
}

:deep(.el-upload-list--picture-card .el-upload-list__item) {
    width: 80px !important;
    height: 80px !important;
}

:deep(.el-upload--picture-card) {
    width: 80px !important;
    height: 80px !important;
    line-height: 80px !important;
}

:deep(.el-upload-list__item-thumbnail) {
    object-fit: cover;
    width: 100% !important;
    height: 100% !important;
    border-radius: 4px;
}
</style>